Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
200/50r18 vs 225/65r18 Tire Comparison Side By Side
  200/50-18 225/65-18 Difference
Diameter inches (mm) 25.87 (657.2) 29.52 (749.7) 3.64 (92.5) 14.1%
Width inches (mm) 7.87 (200) 8.86 (225) 0.98 (25) 12.5%
Circum. inches (mm) 81.29 (2064.65) 92.73 (2355.25) 11.44 (290.6) 14.1%
Sidewall Height inches (mm) 3.94 (100) 5.76 (146.25) 1.82 (46.25) 46.3%
Revolutions per mile (km) 779.47 (484.34) 683.3 (424.58) -96.17 (-59.76) -12.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.81 mph (36.72 km/h)
25 mph (40.23 km/h)28.52 mph (45.9 km/h)
30 mph (48.28 km/h)34.22 mph (55.08 km/h)
35 mph (56.33 km/h)39.93 mph (64.26 km/h)
40 mph (64.37 km/h)45.63 mph (73.43 km/h)
45 mph (72.42 km/h)51.33 mph (82.61 km/h)
50 mph (80.47 km/h)57.04 mph (91.79 km/h)
55 mph (88.51 km/h)62.74 mph (100.97 km/h)
60 mph (96.56 km/h)68.44 mph (110.15 km/h)
65 mph (104.61 km/h)74.15 mph (119.33 km/h)
70 mph (112.65 km/h)79.85 mph (128.51 km/h)
75 mph (120.7 km/h)85.56 mph (137.69 km/h)
80 mph (128.75 km/h)91.26 mph (146.87 km/h)
85 mph (136.79 km/h)96.96 mph (156.05 km/h)
90 mph (144.84 km/h)102.67 mph (165.23 km/h)
95 mph (152.89 km/h)108.37 mph (174.41 km/h)
100 mph (160.93 km/h)114.07 mph (183.59 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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